I have a nitrous dry kit that came with two spray nozzels that go into the air intake. One sprays straight down, and the other sprays off to the right, which would be directly into the throttle body. I have heard that you need the correct air to nitrous mixture when it enters your throttle body, so my question is which would be the best nozzel to use?

 

If i understand this right, one will spray at a 90 degree angle and one sprayws straight out. In that case, if you are putting the nozzle in you air intake duct before the throttle body, you would want to use the one the sprays at a 90 degree angle so it will have a clear shot into the throttle body and motor. Just make sure you put the nozzle in so where it sprays is facing the throttle body.